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The standard deviation was 14.25. At the .05 significance level, is there a difference in the mean number of hamburgers sold at the two locations?
A sample of 60 night shift workers showed that the mean number of units produced was 351. At the .05 significance level, is the number of units produced on the night shift larger?
In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. Find the probability that: exactly four will have this mild side effect.
At the end of the Halloween Festival the organizers estimated that a family of participants spent in average $50.00 with a standard deviation of $15.00. If 49 participants (49 = size of the sample)
according to a survey by the Administrative management Society, one-half of U.S. companies give employees 4 weeks of vacation after they have been with the company for 15 years. Find the probability
Follows a Poisson distribution. Based on this, what is the probability that a 3 square yard section will contain less than 4 weeds?
a multiple-choice test has 15 questions with each having 4 possible answers with one correct. what is the probability that sheer guesswork yields from 5 to 10 correct answer.
Part D asks to show that the Probability of B complement does not equal the Probability of B complement given A complement.
In performing a symmetric approximation, you calculate a mean of the total system cost as $1,725K. The variance is 22500. The POE is $1,600K. What is the probability of overrunning the POE?
Repeat this the exercise with these lognormal X and C. For n=1000, estimate the hazard function and plot against true hazard function.
If these are the only outcomes possible for the business venture, what is the chance that the business venture will be considered Highly Disappointing?
The ages of workers in the Illuminex plant are approximately normally distributed with a mean of 47 years and a standard deviation of 12 years. A worker is stopped at random and asked to fill out a
The hospital tests five vials from each shipment. If at least one of the five is ineffective, find the conditional probability pf that shipment's having come from C.
Assuming the rate found in rotten apples arriving at the packing plan is 10% and there are 12 apples in a bag, what is the probability that at most 2 are rotten.
What is the probability that at least one of the eight shuttle missions scheduled next year results in a critical-item failure?
Locate a z score for 1.645 associated with an alpha of .05 using standard normal areas statistical tables. Then, using a Student's t distribution statistical table, find the 1.645 value. Expla
Suppose that there is a Beta(2,2) prior distribution on the probability theta that a coin will yield a "head" when spun in a specified manner. Calculate the posterior variance.
According to popular belief, 70% of adults enjoy drinking coke. Choose a group of 4 adults at random. what is the probability that none of them enjoy drinking coke ?
Use Excel and determine the number of each type of person that will be needed to complete the job within the allotted time and at minimum cost.
The time it takes a statistics professor to mark a student's midterm is normally distributed with mean 4.6 minutes and standard deviation 1.4 minutes. If there are 75 students in the class, what is
Perform a two-sample z-test for proportions to test if men are more likely than women to make online purchases of books.
a population consists of the following N=5 scores; 0,6,4,3 and 12 compute the population mean and standard deviation.
At a university, 61% of the 7400 students are female. The student newspaper reports results of a survey. Show the population distribution of gender at this university.
The heights of all adults in Canada are normally distributed with a mean of 67 inches and a population standard deviation of 4 inches. For any one person selected at random, what is the probability
The average 1- ounce chocolate chip cookie contains 110 calories. A random sample of 15 different brands of 1- ounce chocolate chip cookies resulted in the following calorie amounts. At the α=